Aid

D&D 2024 spell: Aid. Source: Player's Handbook (2024). level 2, school Abjuration, casting time 1 action, range 30 feet, duration 8 hours

Choose up to three creatures within range. Each target's Hit Points maximum and current Hit Points increase by 5 for the duration.

At Higher Levels

Using a Higher-Level Spell Slot Each target's Hit Points increase by 5 for each spell slot level above 2.

Source: Player's Handbook (2024), p. 239 - Licenses and attribution